The Honor Society of Phi Kappa Phi is an honor society established in 1897 to recognize and encourage superior scholarship without restriction as to the area of study, and to promote the "unity and democracy of education". It was the fourth academic society in the United States to be organized around recognizing academic excellence, and it is the oldest all-discipline honor society. It is a member of the Honor Society Caucus.

In the United States, an honor society is an organization that recognizes individuals who excel in various domains such as academics, leadership, and other personal achievements, not all of which are based on ranking systems. These societies acknowledge excellence among peers in diverse fields and circumstances. The Order of the Arrow, for example, is the National Honor Society of the Boy Scouts of America. While the term commonly refers to scholastic honor societies, which primarily acknowledge students who excel academically or as leaders among their peers, it also applies to other types of societies.